Safety appliance for elevators.



l J. J. KUNTZ.

' SAFETY APPLIANCE FOR ELEVATORS. ,APPu'cATlou `FILED Nov. 1. 1914.

1,1 84,4611. Patented my 23, 1916.

Jorrit a.' nimma, or BROOKLYN," YORK. k

sAFE'rYfAPrLmNcE FOB. ELEVATORS. i

. Specification of T-etters Patent.

ratenteniiiay 23, isis.

I miicaiien mea November 7, i914. seriaiira 870,838.

i u ww ycz/wm t may concern:

Be it known that I, JOHN J. KUNTZ, a citizen of the United States, residing at Brooklyn,pin the county of Kings and State of New York, have invented certain new and useful Improvements in, Safety Applilances for Elevators, of which the following is a full, clear, and exact'specification.

This invention relates to safety appliances for elevators, and has for .its object to provide improved means for automatically breaking the circuit to the controller of an electric elevator whenever one of the ldoors 4to the shaft is left Open or unlocked.

'11?'- struction 'of the circuit breaker used in connection with eachof the doors leading to jthe elevator shaft, which circuit breaker will j not short circuit in the operation of autor ing'drawings, which constitute a part ofthis specicatiom'and then morespecifically de-Y fined in the claim at the end of the speciiication.

In the` accompanying drawings, wherein correspondingparts are indicated by similar reference characters throughout the s everal views: Figure 1 is a diagrammatic view of an elevator shaft with three doors, the middle one of which is open disclosing the controller on the elevator arranged opposite said door, and indicating the circuit from a generator including my improved circuit lbreakers as well as the controller. Fig. 2 40 is an interior side view of one of. my 1mproved circuit breakers, and Fig. 3 is a cross section of the same taken through the opening in the partition to receive the end of the pin carrying the bridging plate when sai plate is pressed into contact with the terminals ofthe circuit, which occurs when the door 'is locked.

In Fig. 1, A, A and A2 designate the doors to an elevator shaft B, and C indicates the controller on the elevator which, as shown, is arranged opposite the open door A. D, D and D2 designate my improved bircuit breakers applied to the frame of each'. of the doors. Each circuit breaker has apspringdaf E which -ispressed inwardaso!.asatqclose the circuit when the A special object is to improve the con-l door` is closed and locked, but which automatically springs outward and breaks the circuit when released by the unlocking and opening of the door. The circuit from the generator F is through conductor G which includes the motor Gr to the top one ofthe circuit breakers, by conductor H from this circuit breaker to the next one by conduc- 'tor I from the second lcircuit breaker to a `iired point c, by looped conductor J from `said fixed point c to the controller, by

looped conductor J from the controller to a f iXed point c', by conductor I from the point c to the third circuit breaker, and by conductor K from the third circuit breaker back to the generator. .It.will thus be seen that when any one of the doors is left unlocked, the corresponding circuit breaker will automatically interrupt the circuit to the controller and prevent the car from being moved until said door has been closed and locked. It lwill be understood that when the door is closed, it engages the pro- ]ecting spring leaf E. and depresses the same to closethe circuit. If the door `is not locked or secured, however, the resiliency of theV leaf willfor'ce. the door open again far enough to break the circuit. In other words, it is necessary to'lock or secure the door in closed Aposition in order to maintain a closed circuit. Consequently, all danger from accidents due to elevator doors being left unlocked Ais effectually avoided.

Referring to Figs. 2 and 3, within the casing of each circuit breaker there is a partition L to which the terminal contacts M, M are secured in spaced relation, the same being suitably insulated from said partition, as at m, m. Intermediate of said contacts, the partition is perforated, as at N. The spring leaf E is secu-red at one end to the outer surface of the casing and is normally pressed outward by a spring O coiled about a guide pin P the outer end of which engages said leaf near its attached end and extends through the wall of the casing and also through the partition L, see Fig. 2. The spring O abutsat one end against the partition and at the other end against a nut Q which is adjustable on the pin P for the purposeof Varying the tension of the spring. The pin P is provided with an adjustable nut R, or other obstruction, on the opposite l side of the partition from the spring, for limiting and the the outward movement of said pin L leaf E.. The adjustability ofthe 1ut 4 permits the normal. angle of the sprmg leaf'.E-with res ect to the casm po regulated to suit iferent doors an oc i Attached to theleaf E near its free end is .'jected. slightly beyond the partition L by a guide pin S extending into .thecasng and throu h the perforation N in the partition L. ounted tos lideon said pin S is a' bridging plate T Anorrnallyrarranged opposite but out of contact with the terminals M and M'. The bridging plate T is backed bly an insulating plate T and is adapted to side alon the guide vgin S` against "the in.-

fluence- -o a spring for equalizing the pressure of said plate uponboth lterminals when the leaf E 1s ressed in. Said bridging` or contact plate The insulating plate T" pro'ects beyond the contact or bridging 'plate all around its edge, so as to prevent said latter plate from short crcuiting with the walls of the casing. The spring U may be coiled around the' pm S so as to abut at one end against the plate for normall holding the same against the washer V w ich abuts against a shoulder V formed at the proper point onsaid in, while the other end of sald springv a uts against an adjustable nut W mounted on a threaded portion W of the pin. As indicated in dotted lines in Fig.` 2, when the lea-f E is pressed in, the bridging plate T will first come in contact with theterminals M and M and then be forcibly held with 's equal pressure against both of said termi- `The inner end, of the pm S is is also insulated from the pin S by a liber bushing s, see Fig. 3.-

' two attesting witnesses nals by the eontractionlof. the spring U asf.

the leaf reaches its fully pressed 1n position'.

opening N inthe'partltion durmg its move# ment. The inner end of the pin P is pro the 1inward movementfof the leaf E, the

spring O being thus contracted and its ten' s1on conse uentlyl increased so that it will automatica ly move the leaf outward again to break the circuit as soon as said leaf is released by the unlocking 0f 'the door to the elevator shaft.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent-of the United States, is:

A circuit breaker 'comprising a.casing, a partition therein, a pairof spaced terminals, a bridging plate carried by they leaf and adapted to engage said terminals when the guided -in the leaf is depressed,ga pin carried by the leaf and extending through the' partition,'an adjustable stop on the ,inner endportion of said pin for limiting-the outward move-l ment of the leaf, an abutment von said in, and a sprin interposed between said .a utment and t e partition for the purpose specified. i l

In testimony 'whereof I have signed my name to this specitcation inthe presence of JOHN .1'.KUNTZ.

Witnesses:

W. B. Guarana, A. Honoris. 

